package com.itheima.springboot_reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.springboot_reggie.commom.R;
import com.itheima.springboot_reggie.entity.Category;
import com.itheima.springboot_reggie.entity.Dish;
import com.itheima.springboot_reggie.entity.DishDto;
import com.itheima.springboot_reggie.entity.DishFlavor;
import com.itheima.springboot_reggie.service.CategoryService;
import com.itheima.springboot_reggie.service.DishFlavorService;
import com.itheima.springboot_reggie.service.DishService;
import com.sun.org.apache.regexp.internal.RE;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * 菜品管理
 */
@RestController
@RequestMapping("/dish")
@Slf4j
public class DishController {
    @Autowired
    private DishService dishService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 新增菜品
     * @param dishDto
     * @return
     */
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto) {
        log.info(dishDto.toString());
        dishService.saveWithFlovor(dishDto);

        //A.清理所有菜品的缓存
        /*Set keys = redisTemplate.keys("dish_*");//获取所有以dish_开头的key
        redisTemplate.delete(keys); */

        //B. 清理当前添加菜品分类下的缓存
        String key = "dish_"+ dishDto.getCategoryId()+"_1";
        redisTemplate.delete(key);

        return R.success("新增菜品成功");
    }

    /**
     * 菜品信息分页查询
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page> page(int page, int pageSize, String name) {
        //构造分页构造器对象
        Page<Dish> pageInfo = new Page<>(page, pageSize);
        Page<DishDto> dishDtoPage = new Page<>();

        //条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        //添加过滤条件
        queryWrapper.like(name != null, Dish::getName, name);
        //添加排序条件
        queryWrapper.orderByDesc(Dish::getUpdateTime);
        //执行分页查询
        dishService.page(pageInfo, queryWrapper);

        //对象拷贝
        BeanUtils.copyProperties(pageInfo, dishDtoPage, "records");
        List<Dish> records = pageInfo.getRecords();
        List<DishDto> list = records.stream().map((item) -> {
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item, dishDto);
            Long categoryId = item.getCategoryId();//分类ID

            //根据Id查询分类对象
            Category category = categoryService.getById(categoryId);

            if (category != null) {
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }
            return dishDto;
        }).collect(Collectors.toList());
        dishDtoPage.setRecords(list);

        return R.success(dishDtoPage);
    }

    /**
     * 根据id查询菜品信息和对应的口味信息
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id) {
        DishDto dishDto = dishService.getByIdWithFlovor(id);
        return R.success(dishDto);
    }

    /**
     * 修改
     * @return
     * @p】aram dishDto
     */
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto) {
        log.info(dishDto.toString());
        dishService.updatedWithFlovor(dishDto);

        //A.清理所有菜品的缓存
        Set keys = redisTemplate.keys("dish_");
        redisTemplate.delete(keys);

        //B.清理当前菜品分类下的缓存
        /*String key ="dish_"+dishDto.getCategoryId()+"_1";
        redisTemplate.delete(key);*/

        return R.success("修改菜品成功");
    }

    /**
     * 根据条件查询对应的菜品数据
     * A. 根据分类ID查询，查询目前正在启售的菜品列表 (已实现)
     * B. 遍历菜品列表，并查询菜品的分类信息及菜品的口味列表
     * C. 组装数据DishDto，并返回
     *
     * @param dish
     * @return
     */
    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish) {


        List<DishDto> dishDtoList = null;
        //动态构造key
        String key = "dish_" + dish.getCategoryId() + "_" + dish.getStatus();
        //先从Redis中获取
        dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get(key);
        if (dishDtoList != null) {
            //如果存在，直接返回，无需查询数据库
            return R.success(dishDtoList);
        }


        //构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId() != null, Dish::getCategoryId, dish.getCategoryId());
        //添加条件，查询状态为1（起售状态）的菜品
        queryWrapper.eq(Dish::getStatus, 1);
        //添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(queryWrapper);

        dishDtoList = list.stream().map((item) -> {
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item, dishDto);

            Long categoryId = item.getCategoryId();//分类id
            //根据id查询分类对象
            Category category = categoryService.getById(categoryId);
            if (category != null) {
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }

            //当前菜品的id
            Long dishId = item.getId();
            LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
            lambdaQueryWrapper.eq(DishFlavor::getDishId, dishId);
            //SQL:select * from dish_flavor where dish_id = ?
            List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);
            dishDto.setFlavors(dishFlavorList);

            return dishDto;
        }).collect(Collectors.toList());

        //如果不存在，需要查询数据库，将查询到的菜品数据缓存到Redis
        redisTemplate.opsForValue().set(key, dishDtoList, 60, TimeUnit.MINUTES);

        return R.success(dishDtoList);
    }
}